"System, can the Rinnegan be upgraded too?"
"Yes."
Uchiha Kei was overjoyed. Without a second thought, he said, "Then upgrade the Rinnegan!"
The system fell silent for a moment.
"The host has not completed the advanced ninjutsu mission. The Rinnegan cannot be upgraded."
Uchiha Kei: ...
At that moment, he particularly wanted to curse.
If it couldn't be upgraded, why the hell had it rambled on about it?
"Then can Jonin-level chakra be upgraded?"
Settling for the next best thing, Uchiha Kei quickly adjusted his mindset.
"It can be upgraded to Kage-level chakra."
Reaching Kage level wasn't bad either.
Uchiha Kei happily applied for the upgrade.
"The host does not have enough Shock Value. Please work harder to shock others!"
If there had been an uninstall function, Uchiha Kei probably wouldn't have hesitated now.
"Then tell me, what can my current Shock Value do?"
"It can upgrade Swordsmanship Mastery."
"Quit talking nonsense. Upgrade it!"
In an instant, Uchiha Kei's mind was filled with countless pieces of knowledge about swordsmanship.
Swordsmanship Mastery had also become Swordsmanship Specialization.
Uchiha Kei subconsciously stroked the ninja sword on his back.
A feeling of blood-bound connection surged up within him.
If he had merely used the sword before...
Now, he had complete control over it!
Though there did not seem to be much difference between using and controlling it, in reality, it raised his understanding of the sword by several levels.
Just then, Uchiha Kei seemed to sense something and slightly turned his head toward the trees on either side.
A playful smile curled across his lips.
"Um... Mr. Tazuna."
Sakura, who had been silent for a long time, suddenly spoke.
"Hm? What is it?"
Tazuna turned his head and looked at Sakura in confusion.
"Mr. Tazuna's country is Wave Country, right?"
"That's right. What